1) I work in an environment were people are always needing to install new software and stuff so I made them Local Admins on their PCs. Is this dangerous and what problems can I have regarding security?

2) The Built-in Account: Administrator : is by default disabled. Should I enable this or should I create another account, for example 'admin' ?

1) I work in an environment were people are always needing to install new software and stuff so I made them Local Admins on their PCs. Is this dangerous and what problems can I have regarding security?

2) The Built-in Account: Administrator : is by default disabled. Should I enable this or should I create another account, for example 'admin' ?

Thanks very much.

This could be a dangerous to the environment because harmful and unauthorized software could be installed. You should have dialog with the end user to make sure they aren't installing software that isn't authorized. Making them an admin is the only way they would be able to install software. If you are using windows 7 or 8 make sure UAC is turned on, at least he or she will get prompted if something tries to install.

Its entirely up to you if you want to create another admin account, but I am not sure why you would need to set up another admin account. If you know the password for the original admin account that is disabled, you should be fine. Are the machines part of any domain?